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HD 183579b: a warm sub-Neptune transiting a solar twin detected by TESS

Hellier

HD 183579b: a warm sub-Neptune transiting a solar twin detected by TESS Thumbnail


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Abstract

We report the discovery and characterization of a transiting warm sub-Neptune planet around the nearby bright (V = 8.75 mag, K = 7.15 mag) solar twin HD 183579, delivered by the Transiting Exoplanet Survey Satellite (TESS). The host star is located 56.8 ± 0.1 pc away with a radius of R* = 0.97 ± 0.02?R? and a mass of M* = 1.03 ± 0.05?M?. We confirm the planetary nature by combining space and ground-based photometry, spectroscopy, and imaging. We find that HD 183579b (TOI-1055b) has a radius of Rp = 3.53 ± 0.13?R? on a 17.47 d orbit with a mass of Mp = 11.2 ± 5.4?M? (3s mass upper limit of 27.4?M?). HD 183579b is the fifth brightest known sub-Neptune planet system in the sky, making it an excellent target for future studies of the interior structure and atmospheric properties. By performing a line-by-line differential analysis using the high-resolution and signal-to-noise ratio HARPS spectra, we find that HD 183579 joins the typical solar twin sample, without a statistically significant refractory element depletion.

Acceptance Date Jul 28, 2021
Publication Date Oct 1, 2021
Publicly Available Date Mar 28, 2024
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Publisher Oxford University Press
Pages 2220 - 2240
DOI https://doi.org/10.1093/mnras/stab2224
Publisher URL https://academic.oup.com/mnras/article-abstract/507/2/2220/6335490?redirectedFrom=fulltext

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